US 10,892,506 B2
Fuel cell system and operating method thereof
Honggang Wang, Malta, NY (US); and Xiangdong Kong, Shanghai (CN)
Assigned to CUMMINS ENTERPRISE LLC, Indianapolis, IN (US)
Filed by CUMMINS ENTERPRISE LLC, Indianapolis, IN (US)
Filed on Jan. 30, 2020, as Appl. No. 16/777,341.
Application 16/777,341 is a division of application No. 15/605,227, filed on May 25, 2017, granted, now 10,593,974.
Claims priority of application No. 2016 1 0363148 (CN), filed on May 27, 2016.
Prior Publication US 2020/0168934 A1, May 28, 2020
Int. Cl. H01M 8/04992 (2016.01); H01M 8/0444 (2016.01); H01M 8/04089 (2016.01); H01M 8/0438 (2016.01); H01M 8/04537 (2016.01)
CPC H01M 8/04992 (2013.01) [H01M 8/04097 (2013.01); H01M 8/04388 (2013.01); H01M 8/04447 (2013.01); H01M 8/04462 (2013.01); H01M 8/04589 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for operating a fuel cell system for generating power, the method comprising:
supplying to a fuel reformer of an anode recirculation loop, a fuel from a fuel supply device and a tail gas from an anode outlet of an anode of a fuel cell stack;
receiving a reformate at a reformer outlet of the fuel reformer, wherein the reformate is divided into a recirculated reformate and a slip reformate, and wherein the recirculated reformate is recirculated back to the anode inlet of the anode;
measuring a fuel flow rate of the fuel provided into a reformer inlet of the fuel reformer;
measuring a current drawn from the fuel cell stack by an electrical load;
measuring a recycle ratio in the anode recirculation loop defined as a flow rate ratio of the recirculated reformate to the reformate; and
estimating a fuel utilization of the fuel cell stack based on the measured fuel flow rate, the measured current and the measured recycle ratio; and
controlling the fuel cell system based on the estimated fuel utilization of the fuel cell stack.